de Sitter Vacua in the String landscape: La Petite Version

TL;DR

This paper reviews conditions under which de Sitter vacua can exist in the string landscape, emphasizing the role of time-dependent internal degrees of freedom and their implications for effective field theories and the swampland.

Contribution

It clarifies the criteria for de Sitter vacua in string theory, highlighting the importance of time-dependent moduli and their impact on effective field theory validity.

Findings

De Sitter vacua with isometries are possible with time-dependent internal fields.

Stable moduli and constant Newton constants are achievable in such backgrounds.

Without time dependence, these backgrounds fall into the swampland.

Abstract

In this review we argue that four-dimensional effective field theory descriptions with de Sitter isometries are allowed in the presence of time-dependent internal degrees of freedom in type IIB string landscape. Both moduli stabilizations and time-independent Newton constants are possible in such backgrounds. However once the time-dependences are switched off, there appear no possibilities of effective field theory descriptions and these backgrounds are in the swampland.